<template>
  <div id="app">
    <router-view></router-view>
  </div>
</template>

<script>
export default {
  name: "app",
    created() {
        //在页面加载时读取sessionStorage里的状态信息
        if (sessionStorage.getItem('store')) {
            this.$store.replaceState(Object.assign({}, this.$store.state, JSON.parse(sessionStorage.getItem('store'))));
        }

        //在页面刷新时将vuex里的信息保存到sessionStorage里
        window.addEventListener('beforeunload', () => {
            sessionStorage.setItem('store', JSON.stringify(this.$store.state));
        });
    },
  components: {}
};
</script>

<style>

</style>
